I have updated K2 from 2.6.9 to 2.7. For a while Google reCaptcha almost worked perfectly.
Sometimes it offered new Google reCaptcha sometimes it offered old Google reCaptcha. But it has always let me comment and publish the comment after I satisfied the reCaptcha.

Now it kind of stopped working. Now it is always showing the new Google reCaptcha but after filling all the fields and satisfying the reCaptcha I always get green tick from reCaptcha with message ‘I’m not a robot’ but after the ‘Submit commnet’ button I always get message ‘The words you typed did not match the ones displayed. Please try again.'

Joomla! 3.5.1
K2 2.7.0
Load jQuery is enabled

What can I do now to solve this error and how?

Thanks for help.

Hi,
Can you provide a link ?

nov.izletko.si/kam-na-izlet/pomurska/kraj.html

Most likely both reCaptcha plugins are being executed at the same time.
Can you temporarily disable the core reCaptcha plugin?

the core reCaptcha was never enabled and also now it is not enabled

Can you revert to reCaptcha v1 and see it is working properly?

I haven't instelled reCaptcha v1 or reCaptcha v2 so I don't know where did they came from? New Joomla update or K2 update?

K2 updates,
This setting is located in K2's parameters.

Ah yes. I tried Yes/No in Anti-spam Settings Use reCAPTCHA v2.
v1 works – I can post comments
v2 it doesn’t work - The words you typed did not match the ones displayed. Please try again.

Hi, im new to this forum and couldnt find a new topic button, but its quite the same as this one:

v1 works.
v2 recaptcha works, but the form doesnt continue.
If i refresh the page, the comment is submitted. It's like the page refresh functionallity is missing for v2.
It only shows the loading arrows symbol.

Best regards,
Peter